[Qgis-user] Using color_rgba for symbols from field-value

[Bernd Vogelgesang]

Hi Richard,

thanx for having a look. First I overlooked this option (gnrr ..), but
then, it did not work :(

My layer is a  point layer of bat species found in batboxes. To this
layer, I join a reference list via the species abbreviation to get the
latin name and the colour.

When I now use this layer to categorize the points by species and set my
rgba-field for the symbol colour, there are still random colours applied
to the categories.

Bug, feature or misinterprestation of the workflow?

Bernd

Am 20.01.21 um 18:53 schrieb Richard McDonnell:
> Hi Bernd,
>
> I have tested a little polygon dataset, adding a rgba field (as a text string) and found that QGIS will actually use the Field type: string option to apply the colour. Just select your rgba attribute and it works fine.
>
> hope that helps.
>
> Reagrds,
>
> Richard
>
>
>
>
>
> --
> Richard McDonnell MSc GIS, FME Certified Professional
> FRM Data Management
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> -----Original Message-----
> From: Qgis-user <qgis-user-bounces at lists.osgeo.org> On Behalf Of Bernd Vogelgesang
> Sent: 20 January 2021 17:32
> To: qgis-user <qgis-user at lists.osgeo.org>
> Subject: [Qgis-user] Using color_rgba for symbols from field-value
>
>
>
> Hi,
>
>
>
> I would like to hard-wire the colours for categories with their rgba-values in a field.
>
>
>
> I have a text field named "rgba" and am searching for a way to make this color_rgba-function working.
>
> e.g '146,208,80,255'
>
> It's obvious that my colour-values are an array of strings, which need to be somehow converted to integers to be eaten by the color_rgba.
>
>
>
> So in theory, the string '146,208,80,255' has to become an array, probably by array("rgba"). But this array is an array of strings and not of integers.
>
> Does anyone know how to achive this array of integers, so the
>
> color_rgba(somemagic("rgba") returns my colour?
>
>
>
> Cheers,
>
>
>
> Bernd
>
>
>
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